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How does BLAS get such extreme performance?

... Most arguments to the second question -- assembler, splitting into blocks etc. (but not the less than N^3 algorithms, they are really overdeveloped) -- play a role. But the low velocity of your algorithm is caused essentially by matrix size and the unfortunate arrangement of the three nested loops....
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How to replace multiple strings in a file using PowerShell

... Assuming you can only have one 'something1' or 'something2', etc. per line, you can use a lookup table: $lookupTable = @{ 'something1' = 'something1aa' 'something2' = 'something2bb' 'something3' = 'something3cc' 'something4' = 'something4dd' 'something5' = 'somethi...
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Two-way encryption: I need to store passwords that can be retrieved

...ect against information disclosure vulnerabilities (XSS, remote inclusion, etc). If it gets out, the attacker can eventually crack the encryption (no encryption is 100% un-reversible without the key - As @NullUserException points out this is not entirely true. There are some encryption schemes tha...
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python: How do I know what type of exception occurred?

...ir!") If you want to dig deeper and examine the stack, look at variables etc., use the post_mortem function of the pdb module inside the except block: import pdb pdb.post_mortem() I've found this last method to be invaluable when hunting down bugs. ...
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选中CListCtrl指定行并发送LVN_ITEMCHANGED消息 - C/C++ - 清泛网 - 专注C/C++及内核技术

...stCtrl指定行并发送LVN_ITEMCHANGED消息在使用CListCtrl列表控件程序中,当我们修改了CListCtrl后需要要定位到已修改行,可以使用下面函数实现: 定位并使指定行选中m_list...在使用CListCtrl列表控件程序中,当我们修改了CListCt...
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div布局居中方法 - C/C++ - 清泛网 - 专注C/C++及内核技术

div布局居中方法本文简单介绍一种万能div居中方法,背景div横铺float:left,然后指定显示div宽度并设置margin:auto。思路:背景div横铺float:left,然后指定显示div宽度并设置margin:auto。代码如下: <div class="testbg"> <div class="te...
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register int i;含义 - C/C++ - 清泛网 - 专注C/C++及内核技术

register int i;含义register声明作用是为了提高效率。它明确要求CPU把变量始终保存在寄存器里面,直至它消亡。不过现代编译器都很厉害,根本不需要你多此一...register声明作用是为了提高效率。 它明确要求CPU把变量始终...
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应用程序无法正常启动0xc0150002 - C/C++ - 清泛网 - 专注C/C++及内核技术

应用程序无法正常启动0xc0150002MFC写程序启动不了,报错 0xc0150002。-----------------------解决思路-------------------------打开Windows事件查看器(我电脑右键...MFC写程序启动不了,报错 0xc0150002。 -----------------------解决思路-----------...
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fatal error \"vector iterator + offset out of range\" \"standard C++ ...

... 解决方法:fill_n()函数将在vector中从头开始,将指定个数元素设置为给定值。fill_n函数假定对指定数量元素做写操作是安全。初学者常犯错误是:在没有元素空容器上调用 fill_n 函数,因此需要使用back_inserter ,...
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MFC GDI中位图显示 位图绘制 - C/C++ - 清泛网 - 专注C/C++及内核技术

MFC GDI中位图显示 位图绘制使用BitBlt 或StretchBlt TransparentBlt 绘制,代码如下: 画按钮图标CBitmap bitmap;bitmap.LoadBitmap( IDB_BITMAP_BTN_IMAGES );...使用BitBlt 或 StretchBlt/TransparentBlt 绘制,代码如下: //画按钮图标 CBitmap bitmap; bitmap.Lo...